^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2017 Sean Young <sean@mess.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/pwm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <media/rc-core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define DRIVER_NAME "pwm-ir-tx"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define DEVICE_NAME "PWM IR Transmitter"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct pwm_ir {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct pwm_device *pwm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) unsigned int carrier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) unsigned int duty_cycle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static const struct of_device_id pwm_ir_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) { .compatible = "pwm-ir-tx", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) MODULE_DEVICE_TABLE(of, pwm_ir_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static int pwm_ir_set_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct pwm_ir *pwm_ir = dev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) pwm_ir->duty_cycle = duty_cycle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int pwm_ir_set_carrier(struct rc_dev *dev, u32 carrier)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct pwm_ir *pwm_ir = dev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (!carrier)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) pwm_ir->carrier = carrier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int pwm_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct pwm_ir *pwm_ir = dev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct pwm_device *pwm = pwm_ir->pwm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) int i, duty, period;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ktime_t edge;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) long delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, pwm_ir->carrier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) duty = DIV_ROUND_CLOSEST(pwm_ir->duty_cycle * period, 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) pwm_config(pwm, duty, period);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) edge = ktime_get();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (i % 2) // space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) pwm_disable(pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) pwm_enable(pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) edge = ktime_add_us(edge, txbuf[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) delta = ktime_us_delta(edge, ktime_get());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (delta > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) usleep_range(delta, delta + 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) pwm_disable(pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int pwm_ir_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct pwm_ir *pwm_ir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct rc_dev *rcdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) pwm_ir = devm_kmalloc(&pdev->dev, sizeof(*pwm_ir), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (!pwm_ir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) pwm_ir->pwm = devm_pwm_get(&pdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (IS_ERR(pwm_ir->pwm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return PTR_ERR(pwm_ir->pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) pwm_ir->carrier = 38000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) pwm_ir->duty_cycle = 50;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) rcdev = devm_rc_allocate_device(&pdev->dev, RC_DRIVER_IR_RAW_TX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (!rcdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) rcdev->priv = pwm_ir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) rcdev->driver_name = DRIVER_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) rcdev->device_name = DEVICE_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) rcdev->tx_ir = pwm_ir_tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) rcdev->s_tx_duty_cycle = pwm_ir_set_duty_cycle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) rcdev->s_tx_carrier = pwm_ir_set_carrier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) rc = devm_rc_register_device(&pdev->dev, rcdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) dev_err(&pdev->dev, "failed to register rc device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static struct platform_driver pwm_ir_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) .probe = pwm_ir_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) .name = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) .of_match_table = of_match_ptr(pwm_ir_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) module_platform_driver(pwm_ir_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) MODULE_DESCRIPTION("PWM IR Transmitter");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) MODULE_AUTHOR("Sean Young <sean@mess.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags